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LaMotte DO 6 PLUS, Инструкция по эксплуатации

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6. PROBE MAINTENANCE

The DO 6 PLUS probe has a galvanic measuring element which 

produces an output proportional to the oxygen present in the medium in 

which it is placed. The galvanic probe design allows measurements to be 

taken immediately—without the typical 15 minute wait of polargraphic 

dissolved oxygen probes. 
The probe consists of two parts. The upper part consists of the anode, 

cathode, and dual cable. The lower part consists of a pre-assembled cap, 

and electrolyte solution. 
Oxygen diffuses through the membrane onto the cathode, where the 

oxygen is consumed. This process produces an electrical current which 

f ows through the cable to the meter. The electric current that is produced 

is proportional to the oxygen that passes through the membrane and 

the layer of electrolyte.  This makes it possible to measure the partial 

pressure of oxygen in the sample at a given temperature. 
Since the dissolved oxygen in the sample is consumed by the cathode it 

is essential to have f ow past the membrane to prevent the occurrence of 

false readings. The probe uses very little oxygen for a measurement. This 

enables it to function correctly with liquid movement as low as 2 inch/

sec across membrane.
The permeability of the membrane to oxygen varies greatly with 

temperature. Therefore compensation is needed allow for variations 

in temperature. The DO 6 PLUS probe has built-in temperature 

compensation. 
Proper maintenance will maximize probe life and accurate readings. 

Deposits on the membrane surface will act as a barrier to oxygen 

diffusing through the membrane, so the membrane should be kept clean 

to assure maximum reliability. 
After each use, the probe should be thoroughly rinsed with clean water 

to avoid any hardening of deposits. If growth develops on the probe, a 

disinfecting chemical should be used to clean it. 
NOTE: Although the membrane is strong and not easily damaged, it 

should be wiped gently to cleaning it. If the membrane is punctured, 

damaged, or torn, the probe will not function properly. 
There are no special probe storage requirements. 

Содержание DO 6 PLUS

Страница 1: ...1 Code 5 0107 01 99 Washington Street Melrose MA 02176 Phone 781 665 1400 Toll Free 1 800 517 8431 Visit us at www TestEquipmentDepot com...

Страница 2: ...use of this meter contact the LaMotte Tech Service Department LaMotte Company will not accept any responsibility for damage or malfunction to the meter caused by improper use of the instrument The inf...

Страница 3: ...4 mg L or ppm Calibration 16 4 MEASUREMENT 17 4 1 Temperature Compensation 17 4 2 Taking Measurements 18 4 3 Pressure Salinity Compensated Measurements 18 4 4 Holding a Reading 19 5 SETUP 19 5 1 Conf...

Страница 4: ...4 11 REPLACEMENT PARTS AND ACCESSORIES 36 12 DISSOLVED OXYGEN THEORY 37 Measurement Units 37 What Is Being Measured 37 Air Calibration 38 Applications 38 13 WARRANTY 39 14 REPAIRS 40...

Страница 5: ...ion Temperature measurement is available in degrees Celsius The meter ensures accurate measurement of the dissolved oxygen values through the temperature barometric pressure and salinity compensation...

Страница 6: ...tion mode Pressing while in calibration mode will abort calibration without conf rming value MODE Selects desired measurement mode When pressed simultaneously with ON OFF it will go to the SETUP mode...

Страница 7: ...ay Low Battery annunciator Calibration Mode Annunciator CAL Temperature Mode A T C annunciator parts per million Percentage Percentage Saturation Mode 2 3 Inserting Removing the Rubber Boot Stand 1 To...

Страница 8: ...arrow and lift up Note the polarity of batteries before inserting them into position After the batteries have been replaced reposition the cover and press down until it locks 2 5 Battery Replacement...

Страница 9: ...ctor clockwise until it locks 2 To remove the probe rotate the connector in an anti clockwise direction until it unlocks and slide the connector off the socket 3 Insert the mini phono jack of the temp...

Страница 10: ...e detachable Noryl cap is 16mm in diameter The compact sensing area reduces air entrapment resulting in quick accurate and stable readings The pre assembled cap must be completely submersed in the sol...

Страница 11: ...vision number r is shown brief y before beginning measurement 4 The meter will be in the measurement mode that was in use when it was powered off mg l ppm or T 2 9 Changing the Mode Press MODE to swit...

Страница 12: ...g for 0 oxygen note that the meter will take several minutes to reach 0 saturation value and constant stirring is not required The following table lists calibration values in saturation calibration mo...

Страница 13: ...y default value Most users utilize the automatic temperature compensation feature that uses the sensor that is built into the probe However manual temperature compensation can be used to input a f xed...

Страница 14: ...alibration 1 Rinse the probe thoroughly with DI water or rinse solution 2 Press MODE to select saturation 3 Hold the probe in the air with the tip facing downwards Wait for the reading to stabilize 4...

Страница 15: ...ntage calibration point 0 will display brief y before CAL f ashes The value based on the factory default calibration will be shown 5 Press HOLD ENTER to conf rm the calibration The meter will display...

Страница 16: ...on gently with the probe Wait for the reading to stabilize 4 Press MODE to select mg L ppm 5 Press CAL The CAL indicator and current concentration will display brief y before CAL f ashes The concentra...

Страница 17: ...ture compensation mode For manual temperature compensation manually enter the desired process temperature from 0 to 50 C into the meter The default is 25 C 1 Press MODE to select temperature 2 Press C...

Страница 18: ...ntration mg L or ppm c Temperature T 3 Dip the probe into the sample Stir the solution gently with the probe 4 Allow the reading to stabilize and observe the reading To change the concentration units...

Страница 19: ...non use The HOLD value is not retained when the meter is shut off automatically or manually 5 SETUP There are two setup menus One menu is derived from the saturation and temperature modes the other m...

Страница 20: ...saturation concentration setup only HI mV View the mV value at 100 saturation LO mV View the mV value at 0 saturation Selection of automatic power off 20 min from the last key press Reset Menu A CAL C...

Страница 21: ...21 SEt P will display for 1 second ON OFF MODE Switch off from Saturation or Temperature measurement mode Press and hold MODE key and then switch on or Temperature Setup Menu...

Страница 22: ...22 SEt P will display for 1 second ON OFF MODE Switch off from Concentration measurement mode Press and hold MODE key and then switch on mg L ppm Concentration Setup Menu...

Страница 23: ...lection menu 3 Use or to select YES activate ATC or NO deactivate ATC and activate manual temperature compensation 4 Press HOLD ENTER to conf rm 5 Press CAL to return to measurement mode 5 3 Selection...

Страница 24: ...the theoretical mV value The ratio displays from 0 5 to 1 999 The saturation offset allows the electrode offset adjustment made in Section 5 8 Saturation Offset Adjustment to be viewed 1 From the setu...

Страница 25: ...onds HI mV displays for 1 5 seconds LO mV displays for 1 5 seconds Viewing of the offset percentage adjustment will be available only if set up menu is selected from the DO Saturation or the Temperatu...

Страница 26: ...els of reset Calibration A CAL resets calibration values only User b USR resets all data calibration and other customized setup functions 1 From the setup menu press or to select rSt 5 2 Press HOLD EN...

Страница 27: ...meter should be immersed at the same depth as the probe of the DO 6 PLUS Turn the meter off 3 With the meter off keep the MODE key pressed Press and release ON OFF then release MODE The meter should d...

Страница 28: ...lay will show the current setting either A HG millimeters of mercury or mm Hg or A PA kilopascal or kPa 5 Use or to select the desired barometric pressure units then press HOLD ENTER to conf rm 6 Use...

Страница 29: ...NTER HOLD ENTER HOLD ENTER CO will display for 1 5 seconds CO will display for 1 5 seconds Display will continue to Salinity setting menu b SAL if Set Up menu is entered from mg l ppm mode Otherwise d...

Страница 30: ...ple is consumed by the cathode it is essential to have f ow past the membrane to prevent the occurrence of false readings The probe uses very little oxygen for a measurement This enables it to functio...

Страница 31: ...sing tip 2 Rinse the probe under running water 3 Mount the nozzle tip onto the syringe provided Fill the syringe with the ref ll solution through the tip of the plastic bottle 4 Hold the probe upside...

Страница 32: ...eries Unstable readings a Insuff cient electrolyte in probe b Air bubbles trapped around the probe c Dirty or damaged probe d Probe not deep enough in sample e External noise pickup or induction cause...

Страница 33: ...tempted when the factory calibrated absolute value is below 2 00 Verify the solution is above 2 00 Verify the temperature and salinity settings Recondition the probe UR OR with blinking A annunciator...

Страница 34: ...w only 0 0 HI mV View mV Value at 100 Saturation View only 50 mV LO mV View mV Value at 0 Saturation View only 0 mV AtO 4 Automatic Power Off YES NO YES rSt 5 Reset to Factory Default Menu A CAL Selec...

Страница 35: ...9 mm Hg or 66 6 to 199 9 kPA 1 mm Hg or 0 1 kPA Automatic correction after manual input Automatic Temperature Compensation 0 0 to 50 0 C Manual Temperature Compensation 0 0 to 50 0 C Probe DO Temp Gal...

Страница 36: ...Operating Range 0 to 50 C Power Requirements 4 AAA sized batteries included Battery Life 700 hours Alkaline Batteries Dimensions Meter 15 7 x 8 5 x 4 2 cm 255 g Probe 115 mm x 12 mm Dia 3 ft cable Mem...

Страница 37: ...linity Freshwater holds more oxygen than saltwater 3 ATMOSPHERIC PRESSURE DO decreases with decreasing atmospheric pressure The amount of DO absorbed in water decreases as altitude increases Solubilit...

Страница 38: ...hen DO is reported in terms of partial pressure or Saturation then a temperature and or salinity compensation for oxygen solubility is not necessary Most probes are temperature compensated i e they co...

Страница 39: ...tly In boiler water applications the presence of oxygen in the water will increase corrosion and contribute to boiler scale that inhibits heat transfer In such instances it is critical to keep the DO...

Страница 40: ...be necessary to return the meter for repair or servicing pack the meter carefully in a suitable container with adequate packing material Often a problem can be resolved over the phone or by email If a...

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